--  @testpoint:opengauss关键字ada(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists ada;
create function ada(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function ada;

--关键字带双引号-成功
drop function if exists "ada";
create function "ada"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "ada";

--关键字带单引号-合理报错
drop function if exists 'ada';
create function 'ada'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `ada`;
create function `ada`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/